ECN 203 Lecture Notes - Lecture 16: Market Power, Demand Curve, Natural Monopoly
Document Summary
The process of entry or exit is complete when p = atc. In the long run, p = minimum atc. At this long run equilibrium, firms earn zero profit. So, in the competitive equilibrium: p = mc. Monopoly: a firm that is the sole seller of a product without close substitutes. A monopoly firm has the market power. The ability to influence the market price of the product it sells. A competitive firm has no market power. The main cause of monopolies is barriers to entry - other firms cannot enter the market. A single firm owns a key resource. Ex: de beers owns most of the world"s diamond mines. The government gives a single firm the exclusive right to produce the good. Natural monopoly: a type of monopoly that exists as a result of the high fixed costs or startup costs of operating business in a specific industry.